控制器: WLC2504
AP: 1702i
故障描述：客户网络使用一段时间正常，后面出现AP不定时掉线，数量十多个，需要重启AP才能重新注册上来，有时候一天几次，严重影响使用。
客户环境比较简单，也就一个SSID 而已，经过排查，AP分配的IP地址都已经排除在DHCP 分配列表，而且AP 的IP地址都已经绑定。AP掉线并不固定在那些AP，而是随机的。供电模块基本都不长与80米，所以大面积掉线应该跟这个没太大关系。
首先手机WLC 与AP的日志：
WCL日志：
*bcastReceiveTask: May 27 11:39:36.468:#APF-3-INVALID_INET: apf_net.c:4035 Invalid Inet address source:(fe80::ca00:84ff:fe51:4860) destination: (::). Discarding packet.
*bcastReceiveTask: May 27 11:39:35.632:#APF-3-INVALID_INET: apf_net.c:4035 Invalid Inet address source:(fe80::ca00:84ff:fe51:4860) destination: (::). Discarding packet.
AP日志：
*May 27 11:04:25.311: %DPAA-3-ERROR: !MAJOR BM Error Invalid State; run-out ofbuffers for bpid 2
-Traceback= 11AEF98z 2CC16B0z 2C57E98z2C4F188z 152FE2Cz 152B200z 1239A4Cz 12424C8z 133EF8Cz 1325D1Cz
*May 27 11:04:35.311: %DPAA-3-ERROR: !MAJOR BM Error Invalid State; run-out ofbuffers for bpid 2
-Traceback= 11AEF98z 2CC16B0z 2C57E98z2C4F188z 152FE2Cz 152B200z 1239A4Cz 12424C8z 133EF8Cz 1325D1Cz
AP灯 红、黄、绿三色交替亮灯（ 查找无线控制器）
思科官方日志手册查找，论坛查找，谷歌查找：
Bug ID : CSCuy13464
Traceback error occurs in ROOT while WGB2 trying to associate
Description
Symptom:
AP Models : 2602I(Root),C1570(wgb1),AP702W(wgb2)
Build : ap3g2-k9w7-mx.wnbu_bt.201602030114,c1570-k9w7-mx.wnbu_bt.201602030114,ap1g1-k9w7-mx.wnbu_bt.201602030114
If we joint WGB2 to Root AP traceback error appeares:
**********************************************************
-Traceback= 11B4770z 2AA8408z 2A3EAC0z 2A35DC8z 194FC28z 2A36E18z 2A4940Cz2A43778z 2A42BE8z 14966B0z 14922ACz 14922ACz 1496778z 28D9FDCz
*Feb 3 15:42:41.971: %DPAA-3-ERROR: ! MAJOR BM Error Invalid State; run-out ofbuffers for bpid 2
Conditions:
Workaround:
Issue not observed in 8.2 images.
Further Problem Description:
8.0.120 121都有问题
看IOS release note 可以查找到修复了哪些bug
升级到8.0.133 之后故障排除
